Improvement in steam-engines



.|. HOLLY.

Improvement" in Steam-Engines.

No. 131,545Vl Patented Sep. 24,-1872.

YUixn'rnD STATES.

JOHN HOLLY, OF ROUSEVILLE, PA.,

y ASSIGNOR OF THREE'FOURTHS HIS RIGHT TO JAMESH. DANN AND J. D. GAGE, OF SAME PLACE.

IEVEFROVEEVIENTy IN STEAM-ENGINES.

Speciiication forming part of Letters Patent No 131,545., dated September 24, 187:2;

Nature of the Invention.

This invention relates to certain improvements in steam-engines; and consists of a combination of parts too fully hereinafter described to need a preliminary statement.

General Description. In the drawing, Figure 1 is an elevation of a cylinder with the steam-chest cover and valve-gear removed. Fig. 2 is a cross-section of the steam-chest and cylinder, showing the cut-off disk, &c. Fig. 3 is a view'showing the manner of expanding the cylinder or packing rings; Figs'. 4 and 6, views 'showing thetwo sides of the cut-off disk g and Fig. 5 a crosssection of the same, showing the exhaust ports A represents the frame; B, the cylinder; and O, the steam-chest. The latter is made in the form shown, and is provided with a circular exhaust-port, a, in the center, and four peculiarly-shaped steam-ports, b1 b2 b3 b4, in the valve-seat, as shown in Fig. 1, partly in dotted lines, .opening into the cylinder in the usual manner. D represents the cut-off or reversing valve, which is merely a iiat metal disk having two steam-ports, c c1, which set over the seat of the steam-chest in such a manner that two ofthe ports, b2 b3, shown in dotted lines in Fig. l, will be' closed up, while ports b1 b4 will come opposite'the ports c c in disk D, and

so be open. The upper edge of this disk D is supplied with a number of gear-teeth, d d, which engage with corresponding teeth on a rod, c, which runs across through the top of the steam-chest C, and which is operated by a lever, E. It will be seen that by moving the rod e back and forth the disk D will be partially turned so as to reverse the position of the ports c c and b b. Immediately outside of this disk D is another similar disk, F, (see Figs. 4, 5, and 6,) which is the oscillating valve,

and which is provided with three steam-ports, fl fZ f3, which are cut entirely through the disk, and three exhaust-ports, g1 g2 g3, which are only partially cut through the disk, as shown at g3 in Fig. 5, and which connect at the center above the exhaust-port al in the disk D, and through the valve-seat. (See Fig. 4.) On the back of disk F is a lug, G, Figs. 2 and 5, Vwhich is provided with a slot, h, into which a small feather on the valve-stem H (see Fig. 2) sits, and upon which the eccentric arm I is secured which operates this valve. It will be readily seen that when the eccentric of the engine oscillates the valve F, when the eccentric is as far ahead as it will go, steamport f1 will be above port c2 and b4, while exhaust-port g2 will be above steam-ports c1 and b1, so that the steam will enter the back end of the cylinder first, and thus cause the engine to move ahead until theeccentric reacts upon the valve F and reverses the position of the ports, causing port f1 to cut off the steam from port b4 and bring exhaust-port g3 over port b4, thus allowing the steam in the back end of the cylinder to escape while the steam is let into the opposite end of the cylinder, and so the action goes on, which is, in this respect, precisely-like the common slide-valve.

To reverse the engine the lever E is simply pushed in, and, moving disk D, turns the ports c1 c2 until they are opposite ports b2 and b3, which will bring ste'am-portf3 and exhaust-port g1 into play, thus causing the valve F to act in the opposite direction. This is an important feature of novelty in my invention, as by these simple means I make the engine reversible by the use of only one eccentric, and thereby do away with the link-gear,77 Src., and combine in one device a reversing-gear and starting-bar. The valve being dat and oscillating works only on the surface it covers, and thus does away with the troublesome wearing hollow77 common to sliding and rolling valves; and, being circular, it can be ground in the lathe,7 which is a great advantage in saving of time, Ste. This valve is applicable to all kinds of engines.

Having thus described my invention, what I claim is- 1. The oscillating disk-valve F, formed with the ports fl f2 f3 and g1 g2 g3, as described and arranged Within the steam-chest G, and connected With the valve-stein H, all constructed and arranged as herein specified.

2. The disk D, formed with the ports o1 o2 upon its side and teeth d upon its periphery, in combination With the lever E, rack e, steamchest C, and steam-openings b1 b2 b3 b4, all constructed and arranged substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of tWo subscribing Witnesses.

JOHN HOLLY. Witnesses:

J. R. BRAKE, C. N. WO'ODWARD. 

